海藻酸铜复合凝胶球对铅和汞溶液的吸附性能研究

Study on Adsorption Properties of Copper Alginate Composite Gel Balls for Lead and Mercury Ions

海藻酸盐凝胶球是一类高效、廉价的吸附材料。将海藻酸钠与无毒环保的金属阳离子(Cu^(2+))混合可发生固化反应,可得到不溶于水的具有三维网络结构的聚合物水凝胶:SA-Cu,再与氧化乙烯、活性炭,分子筛形成复合凝胶球SA-Cu-PEO,SA-Cu-PEO-AC和SA-Cu-PEO-4AZ,用于处理水溶液中高浓度的Pb^(2+)和低浓度的Hg^(2+)。在实验条件下,四种复合物凝胶球对Pb^(2+)和Hg^(2+)均表现了优异的去除效果。包埋4A分子筛或活性炭均可以显著提高对两种重金属离子的吸附效果,其中包埋4A分子筛的凝胶球对Pb^(2+)的去除率可以达到98.6%,包埋4A分子筛的凝胶球对Hg^(2+)的去除率达到87%。此类水凝胶材料在水处理领域具有广阔的研究价值和应用前景。

Sodium alginate（SA） gels have been widely used as adsorption materials with high-efficiency and cheaper cost. SA can be solidified by Cu^（2＋） to obtain polymer hydrogel with three-dimentional net structure, named as SA-Cu.In this paper,SA-Cu-PEO, SA-Cu-PEO-AC and SA-Cu-PEO-4 AZ were respectively prepared by adding poly ethylene oxide（PEO）, 4 A molecular sieves or activated carbon in SA-Cu. These alginate composites were used as adsorbents to remove Pb^2＋ and Hg^2＋ in water. Under the experimental condition, all of these copper alginate composite balls exhibited commendable removal effect for Pb^2＋ and Hg^2＋.The adsorption of the two heavy metal ions was significantly improved by embedding 4 A zeolite or active carbon in SA-Cu-PEO, with the Pb^2＋ removal efficiencies of 98.6% for SA-Cu-PEO-4AZ and 87% for SA-Cu-PEO-4AZ.